A hybrid rhythm/pitched instrument, these blocks produce a bright, sharp sound when struck with the included wooden mallets. The sound can also be dampened by stuffing any soft materials such as paper or fabric inside the blocks. Made of sustainably-harvested rubberwood with non-toxic, water-based clear coat and paint, the set measures 30 cm (about 12") long. Musical instruments are excellent for the development of physical coordination, motor skills, sensory processing and a sense of rhythm.